Aberration controllable optical system

Details Aberration controllable optical system Aberration controllable optical system

1997-08-27

1998-11-24

Ben, Loha

Optical: systems and elements

Lens

Multiple component lenses

359764, 359659, G02B 960

Patent

active

058415904

ABSTRACT:
An aberration-controllable optical system has a large angle of view and is capable of continuously varying spherical aberrations from negative values to positive values, including a point at which a sharp image can be produced. A master lens group includes a first sub lens group having a positive refractive power, a second sub lens group having a negative refractive power, and a third sub lens group having a positive refractive power in this order from the object side of the system. The converter lens group includes a positive lens element and a negative lens element in this order from the object side. The on-axis distance of the air gap which is formed between the positive lens element and the negative lens element can be controlled to mainly change the spherical aberrations in this system. When f.sub.m is a master lens group focal length and f.sub.C is a converter lens group focal length, the aberration-controllable optical system satisfies a condition:

REFERENCES:
patent: 4477154 (1984-10-01), Sato
patent: 4576448 (1986-03-01), Ikari
patent: 4792217 (1988-12-01), Yoshioka
patent: 4900141 (1990-02-01), Ohishita
patent: 5086355 (1992-02-01), Kudo et al.
patent: 5357373 (1994-10-01), Yoshioka et al.

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